Metal-drill



(No Model.) 2 Sheets-Sheet 1.

w. mmcenna. METAL DRILL: No. 541,980. Patei eda l 2,1895,

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(No Model.) 7 4 .2 Sheets- -Sheet 2.

W. Jr. McGEHE.

METAL DRILL.

No. 541,9 80. Patented July 2. 1895.

7 UNITED STATES PATENT. OFFICE.

WILLIAM J. MCGEHE, OF BUSHNELL, ILLINOIS.

METAL-=DRILL.

SPECIFICATION forming part of Letters Patent No. 541,980, dated July 2, 1895. Application filed September 10,1894. Serial No. 522,565- (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM J. MCGEHE, a citizen of theUnited States of America, residing at Bushnell, in the county of McDonough and State of Illinois, have invented certain new and useful Improvements in Metal- Drills, of which the following is a specification.

The object of my invention is to improve the continuous drills operated by hand for boring holes in rails or metal plates of any description by simplifying the construction thereof and adding the features, as will be hereinafter described, and particularly pointed out in the claims. I also provide a bracket or support for holding the drills and the plates to'be bored when using the drill for work of this description.

The invention is illustrated by the accompanying drawings, in which- Figure 1 is a side elevation of the drill. Fig. 2 is a front elevation of the same. Fig. 3 is a sectional view on the line so as of Fig. 1. Fig. at is a view of the supporting-bracket. Fig. 5 is a detail of the breast-plate.

The frame of the drill consists of the for- Ward sleeve 1 for the reception of the drillspindle, the rear sleeve 2 to act as a guide for the feed-screw, the two side pieces 2', having an open space between, and the bar 3 extending longitudinally of the drill below the open part of the frame, said bar having its rear part tapered to rest upon the support, as will be described hereinafter.

Extending transversely across the opening in the frame and held in the side pieces thereof is the stationary shaft 4, upon which are journaled the gear-wheels 5 6, having the ratchet-wheels 5 6 cast integral therewith or secured rigidly thereto. These gear-wheels mesh with the pinion 7, secured on the end of the drill-spindle 8, and give said spindle a continuous rotary motion in one direction when actuated.

Extending over the gear and ratchet wheels and also journaled on the shaft 4 is the yoke 9, having a central partition that is also journaled on the shaft, and into a socket formed therein is fitted the operating lever 10. Flanges depend from the under side of the top of the yoke, and in the recess formed by these flanges and the side of the yoke are pivoted the pawls 11 and 12, extending out and engaging with the ratchet-Wheels on 0pposite sides of said yoke. The pawls are held in engagement with the ratchet-wheels by means of the flat springs 11 12*, secured at one end to the side of the yoke and having their free ends pressing on the top of the pawls.

It will be seen that the movement of the operating-lever in either a forward or backward direction will rotate one or the other of the gear-wheels by means of the pawl on one side rotating the ratchet-wheel on that side while the pawl on the opposite side will ride over the teeth of its ratchet-wheel and get a new hold so as to rotate its Wheel when the lever is moved in the opposite direction.

I have provided automatic feeding means for the drill, that can be regulated in accordance with the different classes of metal to be bored, some being much harder than others and requiring the drill to be fed slower.

Depending from one side of the main frame is the flange at, having the bearing-edge a, and to this flange is pivoted the lever 1), having a pawl c pivoted at one end thereof under tension of the spring 70, secured to said lever. A toothed wheel 6, provided with an internally-threaded sleeve f, fitting in the opening in the sleeve 2 of the main frame, is engaged by the pawl c and is fed step by step thereby. Extending through the wheel eand sleeve f is the feed-screw g, the thread of said screw corresponding With the internal thread of the wheel 6 and sleeve f. The wheel e is held against lateral movement by the screw h, the end of which fits in the groove 1' in the periphery of the sleeve f. The rotation of said wheel thus feeds the screw g out.

Secured to the hub of the gear-wheel 6 is a cam j, that rotates therewith. This cam strikes against the end of the lever b and depresses the same, lifting its opposite end, carrying the pawl, and thereby rotating the wheel e. The end of the lever b carrying the pawl is depressed by means of the spring 01, having one end secured on the upper side thereof and its free end bearing under the main frame. A regulating-screw A, held in a projecting lug B on the forward side of the llO lever 19, bears on the under side of the main frame and acts to regulate the distance of the forward end of said lever from the cam 9', and thus determines the distance the said end is to be depressed. As the pawl engaging with the teeth of the wheel 6 is always raised the same height every time the enlarged part of the cam strikes the lever b, the distance traveled by said pawl depends upon how low it is depressedbythe spring d. By setting up the regulating-screw A, and thereby adjusting the lever 12, the movement of the pawl carried thereby and the feed-wheel 6 can be regulated, allowing the feed-screw to be either fed out fast or slow in accordance with the hardness of the metal to be bored. I have provided openings in the periphery of the wheel 6 ,for the insertion of levers, and the wheel maybe turned to feed the drill in this manner.

For supporting the drill as well as the material to be bored when boring flat plates I use the bracket shown in Fig. 4, which consists of a flat plate a", having the ribs b near the top and extending at right angles thereto on each side and running longitudinally thereof. Secured at right angles to the end of this plate is an upright c to provide a rest for the feed-screw of the drill. A sup port for the spindle of the drill is provided at 02, formed of a plate having forked arms, between which the drill-spindle rests, thelower end of said plate being bifurcated and embracing the plate a, each leg thereof resting upon the ribs Z).

To secure a bearing-block for the plate to be bored, I provide the movable upright cl having an opening therein on a line with the drilling-tool. This upright is supported by means of the rearwardly-extending arm having a depending tooth engaging with the teeth formed in the rear part of the upper face of the plate a. The bottom of said upright has an opening therein corresponding to the crosssection of the plate a", thus being provided with flanges that bear under the ribs 11' and act as a guide therefor. The plate a is held ina vertical position by means of the legs 01, secured to the forward part of said plate and extending at right angles on each side thereof and the leg d secured to the rear end of said plate and extending in a'line therewith. The outer ends of said legs are provided with openings for the insertion of screws or spikes to secure said bracket in a stationary position to a suitable bed.

In operation the drillis placed upon the top of the plate a, the tapered rib 3 of the drill resting thereon and supporting the drill, the.

feed-screw bearing against the upright c. The plate to be bored is placed against the upright d and the drill-tool pressing against it will hold it in position. The drill-toolafter piercing the plate enters the opening provided in the upright and may easily be withdrawn from the plate bored.

To state briefly important points in the construction of the drill, it may be noted that the yoke 9 comprises three prongs pivoted on the transverse shaft. The rib 3 forms a center brace on the main frame for strengthening the same longitudinally for connecting the front and rear bearing-boxes and for providing a rest on the rear end of said brace for supporting the rear end of the drill.

The side flange a forms a side rest on the rear partof the main frame, serving as a hearing for the feed-lever and as a rest for holding the frame in position against side draft when using the drill on a railroad.

Inord-er that the drill may be used as a breast-drill, I screw upon the feed-screw a sleeve 00, the end of which carries a pin or journal on which the breast-plate y is arranged and adapted to swivel on the said pin and to bear upon the breast of the operator.

What I claim is- 1. In a hand drill in combination with the main frame having the shaft extending transversely thereof, of the beveled gears and toothed wheels formed integral, journaled on said shaft said gears meshing with a. pinion secured on the drill spindle, a yoke extending over said gear wheels also journaled on said shaft, pivoted pawlsunder spring tension engaging said toothed Wheels and carried by said yoke, a cam secured to one of said gear wheels and rotating therewith, a lever pivoted to an extension of the main frame actuated by said cam, a pawl pivoted on the end of said lever, and a toothed feed wheel for actuating a feed screw whereby the rotation of the gear wheel will rotate said cam and actuate said lever and operate the feed screw, substantially as described.

2. In a hand drill in combination with the main frame having the shaft extending transversely thereof, of the beveled gears andtoothed wheels formed integral journaled on said shaft, said gears meshing with a pinion secured on the drill spindle, a yoke extending over said gear wheels also journaled onsaid shaft, pivoted pawls under spring tension engaging said-toothed wheel and carried by said yoke, a cam secured to one of said gear wheels and rotating therewith, a lever pivoted to an extension of the main frame actuated by said cam, a pawl pivoted on the end of said lever, a toothed feed wheel for actuating a feed screw whereby the rotation of the gear wheel will rotate said cam and actuate said lever and operate the feed screw, and means securedto the lever for regulating the movement of the toothed wheel e and the feed screw, substantially as described.

3. In combination with a metal drill the supporting bracket therefor consisting of the plate at" having thelongitudinal ribs extending at rightangles from the sides thereof and its rear portion toothed, the vertical upright secured to the end of said plate to provide a bearing for the feed screw of the drill, the

inovable bearing plate for-the material to be dle, the mechanism for driving the same and bored havingarearwardly extending arm prothe frame comprising the sides, the central vided with a tooth on the end thereof for enbrace having the depending tapered rear rest, 15 gaging with the teeth of the plate a", substanand the depending side flange forming a side 5 tially as described. rest, substantially as described.

4. In a drill in combination, the drill spin- In testimony whereof I affix my signature die, the gears for operating the same, the in presence of two witnesses. frame inclosing said gears and spindle and a flange depending from the under side of said WILLIAM J. MCGEHE.

10 frame said flange forming a side rest to take Witnesses:

the side draft substantially as described. D. CHAMBERS, 5. In combination in a drill, the drill spin- F. TUTTLE. 

